Radiators



Jan. 17, 1967 S. PRZYBOROWSKI RADIATORS 3 Sheets-Sheet l Filed May 22,1964 FIGQ' INVENTOR.

borows /a' S'an/s/aus pr BY /n/ A TTY Jam 17, 1967 s. PRzYBoRowsKlRADIATORS 3 Sheets-Sheet 2 Filed May 22, 1964 INVENTOR. lam'slausPybomu/s/ United States Patent O 3,298,432 RADIATORS` StanislausPrzyborowski, 234 Allenhurst Road, Amherst, N.Y. 14226 Filed May 22,1964, Ser. No. 369,478 2 Claims. (Cl. 165-153) This invention relates toheat exchange apparatus, and it has particular reference to improved iinand tube cores of the cellular-tubular type adapted for use in`automobile radiators or car heaters.

In modern production of fin and tube cores, the dual desiderata of highthermal efficiency and exceedingly light-weight in the fin elements ofthe core has provoked manufacturing problems, such as difficulty ofproduction and loss of physical strength in the core. This has beenaggravated in the slit fin type of ribbon which is physically weakerthan former types. In the present invention, the handicaps of the slit1in and extremely light gage ribbon is overcome through the provision ofa completely reinforced ribbon which permits clean shearing and constantreproduction with normal tooling methods. The reinforcement is sodevised that it is attained with advantageous increase in thermaleffectiveness as a result of its ability to promote proper air flowcharacteristics.

Otherfeatures of the invention including assembly advantages will bemore fully set forth as this description proceeds, and the novelty willbe pointed out in the appended claims. In the drawings:

FIG. l is a general view of the rear face of a radiator having the linand tube structure of the invention.

FIGS. 2 and 3 are side and bottom views of the radiator of FIG. 1.

FIG. 4 is an enlarged section on the line 4-4 of FIG. 2.

FIG. 5 is an enlarged section on the line 5-5 of FIG. 4.

FIG. 6 is an enlarged fragmentary side elevation as viewed from theright of FIG. 3.

FIG. 7 is an enlarged fragmentary section on the line 7-7 of FIG. 6.

FIG. 8 is a view of the radiator ribbon after the first forming thereof,and before the nal forming operation.

FIGS. 9 and 10 are views similiar to FIG. 8 where the ribbon is providedwith differing preliminary forming.

FIG. ll is an enlarged fragmentary cross section similar to FIG. 4 ofanother embodiment of the invention where the ribbon of FIG. 10 is used.

FIG. 12 is a view showing diagrammatically the forming steps involved inthe production of the ribbon.

The radiator 10 of FIG. l consists of upper and lower tanks 11 and 12,respectively, between which extend equally spaced parallel tubes 13 ofthe typical flat cross section. Fins 14 in the form of zig-zag ribbonsoccupy the spaces between adjacent tubes and contact the tubes toprovide extended heat exchange surface as well understood in the art. Y

The fins 14, wherein the invention resides, are of the slit type withthe difference that in its preliminary form has a at ribbon R (FIG. 8)with advantageously located reinforcements before finally being lslit`and formed into zig-zag formation. This Will be better understood byreferring to FIG. 12 where a coil C of at ribbon material is introducedbetween preliminary forming rolls F to provide the pre-formed at ribbonR of FIG. 8, whereupon it then passes through rolls Z, wherein theribbon is finally formed into slit and zig-zag formation before beingcut into proper lengths in a shearing unit S. In FIG. 8, there is showna portion of a preliminary formed ribbon R which is used in the formillustrated in FIGS. l through 8, inclusive. It will be seen that themarginal and medial portions 15 and 16 of the ribbon are provided withtransverse corrugations 17 and 18, respectively. In the intermediateareas M between such corrugations, equally 'ice spaced continuousvertical ribs 19 are provided. When the ribbon is folded into zig-zagformation to provide the finished fins 14, the folds 20 thereof arenearly parallel as appears in FIG. 7, where the marginal corrugations 17may be seen to the left of such view. Referring now to FIGS. 4, 5 and 6,it will be seen that the intermediate areas M are cut to provide slitportions 22 having the same spacing as the vertical ribs 19 which occupythe center of each slit portion. The slit portions 22 are bent inangular fashion to provide a plurality of air inlet nozzles 23, therebyproviding a structure capable of disseminating air owing from the frontto the rear of the radiator core 10.

The medial portion 16 of each fold 20 is formed with an enlargedtruncation 25 having a flat top 26 containing the previously describedcentral corrugation 18 and sloping sides 27 terminating at the innermostof the slits 22. The right hand folds as located in the conventionalsection FIG. 7 show the corrugated formation at the center of thetruncations 25, while the intermediate folds show sections through thevertical ribs 19 of the slit portions 22.

It is preferred that the crests 24 of the zig-zag formation of thelfolds 20 be sligthly depressed at areas which are contacted by thetubes 13 to form saddles 29. Such saddles are very slightly offset fromthe top of each press, and in providing a moderate seat for each tube,-it effects a better soldering operation as will be presently described.

It will be observed in FIG. 5 that in the outermost slit portionsadjacent the margin of the ribbon that the corrugations 17 have actuallybeen cut through. This is advantageous particularly when the ribbon isof minimum thickness, since it has been found that clean shearing evenwith the fairly dull tools can be effected.

In the embodiment of the invention FIGS. 10 and 11, the ribbon R1 ispreliminarily formed throughout its area with a herringbone formation ofribs 32 of extremely fine spacing. When this ribbon is given its nalprocessing, it appears -as in FIG. ll, wherein the ns 33 are bent intofolds 30 as in the first embodiment of the invention. 'Ihe folds 30 arecut to provide a plurality of slit portions 34, and a medial portion 35containing an enlarged truncation 36. The crests 37 are formed withdepressed areas which form saddles 291 for receiving the tubes as in thefirst embodiment of the invention.

The ribs -and/or corrugations as described are useful during the processof forming and slitting the ribbon and also provide yafter assembly ofthe radiator, a selectively strengthened structure, not interfering withbut rather enhancing the heat exchange values of the radiator. It istherefore not intended that the invention be limited to the preciselocation and disposal of such ribs and corrugations since it isanticipated that they may be variously applied, depending on the typeand usage of the radiator. For example, in FIG. 9, a uniformlytransverse rib 38 in a ribbon R11 is shown. This may be useful in coreswhere compressive yielding of tthe ribbons is desired. It is thereforeintended that numerous variations of the principle heretofore describedmay be used without departing from the spirit of the invention except asset forth in the accompanying claims wherein,

I claim:

1. A radiator comprising spaced tanks, each having header portions, acore including a plurality of independent tubes having an elongatedcross-section, said tubes being positioned between said headers andbeing grouped in rows at the `front and back of the core with theirnarrow dimensions disposed transversely, and continuous fins of Zig-Zagformation disposed between said rows, said zig-zag formation consistingof crest portions and relatively planar folds, a plurality of slitsformed in each of said folds, said slits being disposed relativelyperpendicular to Patented Jan. 17, 1967` said crest portions and havingportions offset relative to the planar folds, and corrugations of finepitch formed in said fins and disposed angularly With respect to saidslits, said corrugations being of a herringbone arrangement and beingdisposed throughout 4a major area of said folds, said tubes being soldercoated to permit bonding of the tubes to the tins upon application ofheat.

2. A radiator comprising spaced tanks, each having header portions, acore including a plurality of independent tubes having an elongatedcross-section, said tubes being positioned between said headers andbeing grouped in rows at the front and back of the core with theirnarrow dimensions disposed transversely, and continuous ins of zig-zagformation consisting of crest portions and relatively planar folds, aplurality of slits formed in each of said folds, said slits beingdisposed relatively perpendicular to said crest portions and havingportions oset relative to the planar folds, and corrugations of ne pitchformed in said ns in the marginal portions of the folds thereof disposedsubstantially parallel to each other and to said crest portions, andribs formed in each slit portion of said folds, said ribs being disposedsubstan- References Cited by the Examiner UNITED STATES PATENTS1,950,500 3/1934 Loprich et al. 165-152 2,011,854 8/1935 Emmons et al.113-118 2,063,757 12/1936 Saunders 165-153 2,252,210 r8/1941 Seemiller113-118 3,003,749 10/1961 Morse 165-152 FOREIGN PATENTS 635,188 4/1950Great Britain.

ROBERT A. OLEARY, Primary Examiner.

v 20 A. W. DAVIS, Assistant Examiner.

2. A RADIATOR COMPRISING SPACED TANKS, EACH HAVING HEADER PORTIONS, ACORE INCLUDING A PLURALITY OF INDEPENDENT TUBES HAVING AN ELONGATEDCROSS-SECTION, SAID TUBES BEING POSITIONED BETWEEN SAID HEADERS ANDBEING GROUPED IN ROWS AT THE FRONT BACK OF THE CORE WITH THEIR NARROWDIMENSIONS DISPOSED TRANSVERSELY, AND CONTINUOUS FINS OF ZIG-ZAGFORMATION CONSISTING OF CREST PORTIONS AND RELATIVELY PLANAR FOLDS, APLURALITY OF SLITS FORMED IN EACH OF SAID FOLDS, SAID SLITS BEINGDISPOSED RELATIVELY PERPENDICULAR TO SAID CREST PORTIONS AND HAVINGPORTIONS OFFSET RELATIVE TO THE PLANAR FOLDS, AND CORRUGATIONS OF FINEPITCH FORMED IN SAID FINS IN THE MARGINAL PORTIONS OF THE FOLDS THEREOFDISPOSED SUBSTANTIALLY PARALLEL TO EACH OTHER AND TO SAID CRESTPORTIONS, AND RIBS FORMED IN EACH SLIT PORTION OF SAID FOLDS, SAID RIBSBEING DISPOSED SUBSTANTIALLY PARALLEL TO SAID SLIT PORTIONS, SAID TUBESBEING SOLDER COATED TO PERMIT BONDING OF THE TUBES TO THE FINS UPONAPPLICATION OF HEAT.